A Paleomagnetic, Geochemical and U-Pb Geochronological Comparison of the Thule (Greenland) and Devon Island (Canada) Dyke Swarms and Its Relevance to the Nares Strait Problem
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Bibliographic record
Abstract
Abstr act: The Nares Strait controversy concerns the debate about whether or not a major sinistral transcurrent fault (the Wegener Fault) separates northern Greenland and Canada. To date no firm evidence has been found for the proposed 200 km sinistral offset, and to the contrary, geological correlations, mainly involving Paleozoic rocks across the Nares Strait, suggest that total left-lateral motion is no more than 70 km. The E–W trending Thule (Greenland) and Devon Island (Canada) dyke swarms lie on opposite sides of Baffin Bay and are offset sinistrally about 200 km, suggesting that if their correlation is established a convincing case for the Wegener Fault can be made. Paleomagnetic, geochemical and petrographic data allow, but do not yet establish, the correlation. Paleomagnetic results for Canadian sites (VGP = 6.9°N, 181.8 °E, A95 = 12.7°, N = 5) and Greenland sites (VGP = 11.5 °N, 178.3 °E, A95 = 13.8°, N = 4) are not significantly different at the 95 % confidence level. These levels are too large to resolve whether or not the Thule and Devon Island swarms have been offset. Geochemical data reveal a distinct and identical pattern in incompatible elements, while petrographically, the dykes are indistinguishable. U-Pb geochronological results for a Canadian dyke (720.2 ±2.0 Ma) and a Thule dyke (720.4 ±2.7 Ma) are identical within error and clearly identify the two sets of dykes as being parts of the same magmatic episode. Zusammenfassung: Bei der Nares Strait-Kontroverse geht es um die Debatte, ob eine bedeutende Links-Seitenverschiebung (die Wegener-Storung) Nordgronland von Kanada trennt. Bis heute sind keine zwingenden Belege fur die postulierten 200 km Transportweite gefunden worden. Im Gegenteil: Geologische Korrelationen von palaozoischen Gesteinseinheiten auf beiden Seiten der Meeresstrase reduzieren die maximalen sinistralen Transportweiten zu nicht mehr als 70 km. Die E–W-streichenden Thule-Gangschwarme (in Gronland) und Devon-Gangschwarme (in Kanada) liegen auf beiden Seiten der Baffin Bay und erscheinen ca. 200 km sinistral versetzt. Falls die Korrelation dieser Gangschwarme gelingt, kann ein wichtiges Argument fur die Existenz der Wegener-Storung geliefert werden. Palaomagnetische, geochemische und petrographische Daten erlauben eine Korrelation, wenn sie sie auch bisher noch nicht beweisen. Palaomagnetische Ergebnisse von kanadischen Gangen (VGP = 6,9°N, 181,8 °E, A95 = 12,7°, N = 5) und Vorkommen in Gronland (VGP= 11,5 °N, 178,3 °E, A95 = 13,8°, N = 4) sind im 95 % Konfidenzrahmen nicht hinreichend verschieden. Diese Daten sind jedoch nicht genau genug, um zu entscheiden, ob die Thule- und Devon-Gangschwarme versetzt sind. Geochemische Daten zeigen eine deutliche, identische Verteilung der inkompatiblen Elemente, wahrend petrographische Daten gleichfalls keine Unterschiede zeigen. Geochronologische (U-Pb) Ergebnisse fur einen kanadischen Gang sind innerhalb der Fehlergrenzen mit 720,2 ±2,0 Ma identisch mit 720,4 ±2,7 Ma fur einen Thule-Gang. Die Ergebnisse machen deutlich, dass die beiden Gangprovinzen Teil desselben magmatischen Ereignisses sind.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it